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Time & Work
Time, Distance and Speed

A can complete a work in 10 days, while B can complete the same work in 15 days. How many days will they take to complete the work together?

Answer: A. 6 days
A's work rate is 1/10 and B's is 1/15. Together, they work at a rate of 1/10 + 1/15 = 1/6. Thus, they complete the work in 6 days.
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